HCG Levels

So I've been reading a lot about HCG levels which is something I never paid attention to in my first pregnancy but what is considered "high". I keep having my mother in law tease me that there are going to be "two heartbeats" at the ultrasound and then when I told her the HCG level she just said oh yeah thats really high for your week. I'm usually not gullable but I am super curious if there is a "standard" for HCG levels for certain weeks that you are pregnant. I'm officially 6 weeks pregnant today! Any advice or wisdom would be nice!! Thanks!